A water-saving environmentalist publishes a detailed explanation on how he harvests rainwater to fill his toilet.

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Domestic potable water collection requires effort, energy, and chemicals for purification and transport. Toilets use 20 to 25% of water consumed in a residential house. Why are we flushing drinkable water down the toilet? In some other countries of the world, rainwater harvesting on a residential level is a mandatory part of building codes.

There's quite a bit of setup involved here, but it's still, a neat and satisfying way to save the environment and money on water bills.